# bash completion for gzip

have gzip || have pigz &&
_gzip()
{
    local cur prev xspec helpopts

    COMPREPLY=()
    _get_comp_words_by_ref cur prev
    helpopts=`_parse_help ${COMP_WORDS[0]}`

    case $prev in
        -b|--blocksize|-p|--processes|-S|--suffix|-h|--help|-V|--version)
            return 0
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W "$helpopts -1 -2 -3 -4 -5 -6 -7 -8 -9" \
            -- "$cur" ) )
        return 0
    fi

    local IFS=$'\t\n'

    xspec="*.@(gz|t[ag]z)"
    if [[ "$prev" == --* ]]; then
        [[ "$prev" == --decompress || \
            "$prev" == --list || \
            "$prev" == --test ]] && xspec="!"$xspec
        [[ "$prev" == --force ]] && xspec=
    elif [[ "$prev" == -* ]]; then
        [[ "$prev" == -*[dlt]* ]] && xspec="!"$xspec
        [[ "$prev" == -*f* ]] && xspec=
    elif [[ "$prev" == '>' || "$prev" == '>>' ]]; then
        xspec=
    elif [ "$prev" = '<' ]; then
        xspec=
    fi

    _expand || return 0

    COMPREPLY=( $( compgen -f -X "$xspec" -- "$cur" ) \
        $( compgen -d -- "$cur" ) )
} &&
complete -F _gzip -o filenames gzip pigz

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